assert_is_object_safe<T>()1 fn assert_is_object_safe<T>() {}
2
3 #[test]
future()4 fn future() {
5 // `FutureExt`, `TryFutureExt` and `UnsafeFutureObj` are not object safe.
6 use futures::future::{FusedFuture, Future, TryFuture};
7
8 assert_is_object_safe::<&dyn Future<Output = ()>>();
9 assert_is_object_safe::<&dyn FusedFuture<Output = ()>>();
10 assert_is_object_safe::<&dyn TryFuture<Ok = (), Error = (), Output = Result<(), ()>>>();
11 }
12
13 #[test]
stream()14 fn stream() {
15 // `StreamExt` and `TryStreamExt` are not object safe.
16 use futures::stream::{FusedStream, Stream, TryStream};
17
18 assert_is_object_safe::<&dyn Stream<Item = ()>>();
19 assert_is_object_safe::<&dyn FusedStream<Item = ()>>();
20 assert_is_object_safe::<&dyn TryStream<Ok = (), Error = (), Item = Result<(), ()>>>();
21 }
22
23 #[test]
sink()24 fn sink() {
25 // `SinkExt` is not object safe.
26 use futures::sink::Sink;
27
28 assert_is_object_safe::<&dyn Sink<(), Error = ()>>();
29 }
30
31 #[test]
io()32 fn io() {
33 // `AsyncReadExt`, `AsyncWriteExt`, `AsyncSeekExt` and `AsyncBufReadExt` are not object safe.
34 use futures::io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite};
35
36 assert_is_object_safe::<&dyn AsyncRead>();
37 assert_is_object_safe::<&dyn AsyncWrite>();
38 assert_is_object_safe::<&dyn AsyncSeek>();
39 assert_is_object_safe::<&dyn AsyncBufRead>();
40 }
41
42 #[test]
task()43 fn task() {
44 // `ArcWake`, `SpawnExt` and `LocalSpawnExt` are not object safe.
45 use futures::task::{LocalSpawn, Spawn};
46
47 assert_is_object_safe::<&dyn Spawn>();
48 assert_is_object_safe::<&dyn LocalSpawn>();
49 }
50